Advances in Astronomy and Space Physics, Volume 10, Issue 2, PP. 43-47 (2020)
doi: 10.17721/2227-1481.10.43-47
Spectra of comet C/2002 T7 (LINEAR)
1Main Astronomical Observatory of the NAS of Ukraine, 27 Akademika Zabolotnoho Str., 03143 Kyiv, Ukraine
2Special Astrophysical Observatory, Nizhnij Arkhyz, 369167, Russia
3Astronomical Observatory of Taras Shevchenko National University of Kyiv, 3 Observatorna Str., 04053 Ukraine
4Astronomical Institute of Slovak Academy of Sciences, SK-05960, Tatranská Lomnica, Slovak Republic
2Special Astrophysical Observatory, Nizhnij Arkhyz, 369167, Russia
3Astronomical Observatory of Taras Shevchenko National University of Kyiv, 3 Observatorna Str., 04053 Ukraine
4Astronomical Institute of Slovak Academy of Sciences, SK-05960, Tatranská Lomnica, Slovak Republic
Abstract
We present the results of spectral observations of comet C/2002 T7 (LINEAR) carried out at the 1-m Zeiss-1000 telescope of the Special Astrophysical Observatory (Russia). The spectra were obtained within the 3500-7500 Å wavelength range on November 13, 14, and 21, 2003, before the perihelion passage, when heliocentric and geocentric distances of the comet were about 2.7 AU and 1.8 AU, respectively. Spectra do not show any emission features from the strongest cometary emissions of the CN, C2, and C3 molecules. The normalised spectral gradient of reflectivity is 2.8% per 1000 Å and 5.4% per 1000 Å for November 14 and 21, respectively. The Afρ parameter, which characterises the dust production rate in the comet, is on average about 800 cm. Comet C/2002 T7 (LINEAR) can be classified as belonging to the group of dusty comets
Keywords:
comets: individual: C/2002 T7 (LINEAR)